Combustion Flue Gas, Products, Testo

CO detector – testo 317-3


“Carbon monoxide is a particularly dangerous gas. It is colorless, it is odorless and above all it is lethal. That’s why it is so important that CO checks are carried out when a gas heating or boiler is being serviced or installed. This not only ensures that the heating or boiler is working properly; it also helps to prevent tragic accidents that occur as a result of carbon monoxide poisoning.

The testo 317-3 CO detector. for measuring carbon monoxide in the surrounding air

A few seconds. That’s all it takes. That’s all it takes to be on the safe side and test the surrounding air for carbon monoxide. The testo 317-3 CO detector measures the concentration of carbon monoxide in the surrounding air and presents the readings on an easy-to-read display. The CO detector has both a visual and an audible alarm which are triggered when a threshold is crossed. The thresholds can be adjusted individually.

The CO detector comes with a carry case and a belt clip to ensure that you always have your meter on you and a handstrap which can be wrapped loosely around the wrist to prevent the meter from falling onto the floor.

And as if that wasn’t enough, testo 317-3 CO detector also comes with a 3-year CO sensor warranty.”

  • Ready to go: no zeroing phase
  • Alarm with adjustable thresholds
  • 3-year CO sensor warranty
  • Carry case with belt clip and handstrap
Delivery Scope

testo 317-3 CO detector for measuring CO in the surrounding air, carry case, belt clip, earphones, handstrap, calibration certificate


Download Datasheet Instruction manual

Application Image

Technical Details

Ambient CO
Measuring range 0 to +1999 ppm
Accuracy ±3 ppm (0 to +29 ppm), ±10 % (+30 to +1999 ppm)
Resolution 1 ppm

General technical data
Operating temperature -5 to +45 °C
Battery type 2 AAA micro batteries
Battery life 150 h (with beeper switched off)
Storage temperature -20 to +45 °C